Siemens SENTRON 3VA27 - Page 58

Description
2.8 Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
56 Manual, 10/2018, L1V30499596002-01
Protection functions
Protection functions of the electronic trip units
ETU320
LI
ETU350
LSI
ETU360
LSIG
ETU650
LSI
ETU660
LSIG
Rotary coding switch
Display (LCD)
Protection functions
Overload protection (LT)
●
●
●
●
●
Short-time-delayed short-circuit
protection (ST)
— ● ● ● ●
Instantaneous short-circuit protec-
tion (INST)
● ● ● ● ●
Neutral protection (N)
●
●
●
●
●
Ground-fault protection (GF)
—
—
●
—
●
Enhanced protection functions
Making current release (MCR)
1)
—
—
—
●
●
Current unbalance protection (I-
NBA)
— — — ● ●
DAS protection - arc fault mitigation
mode
— — — ● ●
Ground fault return (G
ret
)
1)
—
—
—
—
●
2nd parameter set (set A/B)
—
—
—
●
●
With metering function
MF Advanced
Residual current protection (Rc)
—
—
—
—
●
2)
Direct short-time protection (DST)
—
—
—
●
●
Voltage unbalance protection (V-
NBA)
— — — ● ●
Undervoltage protection (V
u
)
—
—
—
●
●
Overvoltage protection (V
o
)
—
—
—
●
●
Underfrequency protection (f
u
)
—
—
—
●
●
Overfrequency protection (f
o
)
—
—
—
●
●
Reverse active power protection
(RP)
— — — ● ●
Phase sequence check L1-L3
—
—
—
●
●
COS PHI protection (alarm/trip)
—
—
—
●
●
1)
Breaker Connect module required for auxiliary power supply
2)
Summation current transformer (Rc CT) and rating plug (Rc) required to permit the protection function